Nut lock



W. L. BONIN Sept. 18, 1951 NUT LOCK Filed May 20, 1946 Patented Sept. 18, 1951 OFFICE 2,568,483 NUT noon 7 Wilfred L. Bonin, ween-com, m1. Application May 20, 1940, Serial No. 670.924

The present invention relates to a novel nut lock designed for use with textile machinery and other apparatus which are subject to heavy pulls and to vibration.

The principal object of the invention is to provide a novel nut lock which permits a nut to be readily threaded on a bolt but prevents the nut from unthreading except by intention.

Another object of the invention is to provide an effective nut lock of very simple construction, which may be readily manufactured at low cost.

With the above and other objects and advantageous features in view, the invention consists of a novel arrangement of parts more fully disclosed in the detailed description following, in conjunction with the accompanying drawings, and more specifically defined in the append claim.

In the drawings:

Fig. 1 is a perspective view of a nut and bolt arrangement embodying the invention;

Fig. 2 is an enlarged view of the bolt end, showing the preferred shape of lock groove;

Fig. 3 is an enlarged transverse section on the line 3--3 of Fig. l V

Fig. 4 is a section on the line 4-4 ofFig. 3; v;

Fig. 5 is a perspective view of the novel lock lever; and

Fig. 6 is a perspective detail of the lock lever spring and plunger. i

It has been found desirable to provide at very simple construction for an effective lock nut, whereby a low cost of manufacture results. To this end, I form the nut with a transverse slot in which a lock lever is pivotally mounted, the parts being so arranged that the movement of the lock lever is within prescribed limits only, and I position a spring pressed plunger in a bore to press against the outer end of the lock lever. the bore being in line with the lock lever slot, whereby the number of manufacturing operations is greatly reduced and the assembly is quickly performed.

Referring to the drawings, the novel nut lock arrangement Ill includes a bolt II', which may be of any suitable material and of any suitable size, and a novel nut l2 which is designed to readily thread on the bolt H, but which cannot be un threaded from the bolt except by design and intention.

The bolt II is provided with the usual threads I3 and with a plurality of spaced longitudinal surface grooves [4, the preferred number being three. The grooves extend from the outer end of the bolt to the inner end of the screw threads 13, and are preferably of V-shaped formation.

1 Claim; (Cl. 151-40) 2 The novel nut 12 has a central bore I5 therethrough which has internal threads [6 to cooperate with the threads l3 of the bolt H, and is provided with a transverse slot I'I shaped topro vide a narrowslot channel l8 at one end of the is pivotally mounted in the slot IT, as by'means of a pin 2|, and has its forward end 22 cut reentrantly as indicated at 23 to provide spaced teeth 24 and 25, the tooth 24 being adapted to enter wihin the bore l5 and selectively engage with and seat inthe grooves 14, and the tooth 25 being adapted to engage the inner surface 25 of the slot and limit inward movement of the tooth 24.

A transverse bore 21 is drilled in the nut H, in line with oneside thereof, with its opening within the slot channel l8, whereby the bore may be readily formed by drilling after the slot has been cut. A plunger 28 and a compression spring 29 are positioned within the bore 21, as shown in Fig. 2, the outer end of the plunger extending into the slot channel I8 to press against the outer end 30 of the lock lever 20, thus continually urging the lock lever end 30 outwardly and the lock lever end 22 inwardly.

When the end 30 of th lever 20 is pressed outwardly by the spring pressed plunger 28, as shown in Fig. 3,. it extends slightly beyond the walls of the slot channel 18 so that it may be readily manually engaged for pressing inwardly against the pressure of the spring 29, to move the end 22 outwardly and permit unthreading of the nut from the bolt.

The tooth 25 is preferably V-shaped to cooperate with the corresponding shape of the bolt grooves I4, the angular relation of the parts, see Fig. 8, being such that threading movement of the bolt forces the tooth 24 out of the grooves I4 against the spring tension exerted on the other end of the locking level. It is thus impossible for the locking tooth 24 to catch within a groove I4 and lock against unthreading of the nut It.

The construction for the novel lock nut arrangement is thus of simple character. The nut blank has a single slot cut therein, and two openings are drilled in the slotted nut blank, one to receive the plunger 28 and its spring 29 and the other extending transversely across the slot l1 to receive the hinge pin 2|. The lock lever 20 is readily stamped out of sheet metal. The in proved nut lock thus consists of a small number of readily manufactured and assembled parts, uses no flat springs which are difiicult to retain in ei- 3 fective operative position, and has the advantage that inward movement of the locking end of the lock lever is limited by engagement with the inner surface of the slot.

Although I have described a specific constructional embodiment of my invention, it is obvious that changes in the shape, size and proportion of the parts and in their relative arrangement may be made to suit the requirements for difierent nut locks, without departing from the spirit-andythe' scope of theinvention as defined in the appended claim.

having at least one longitudinal groove extend ing across the threads, and a nut ihavingangin-wternally threaded bore for engagingthebolt,said I end-,Iprmed with spacedteeth of a shape, the.

outer end of the lock lever being positionedinthe narrow slot portion, and the lock lever being pivotally mounted in the triangularrslot portion in-' termediatethe lever ends, one tooth of the lockleverinner end being adapted to enter the bore:

' nut having linear sides and a channel'substantial'.

and seat in the bolt groove and the other tooth being adapted to contact one side of the triangular slot portion to limit bore-entering movement of the first tooth, said nuthaving a bore positioned diametrically opposite the lever inner end in the plane of the narrow slot portion and extending inwardly therefrom, and a spring pressed plunger movably seated in said bore and engaging the outer end of the lock lever to urge thelock lever outer end outwardly and thefinn'er lock lever end inwardly into the internally threa'dedb'ore.

WILFRED L. BONIN.

REFERENCES CITED The following references are of record in the file of-this patent:

UNl TED :LSTATES PATENTS 

